Device for securing an asbestos covering and plaster to a hot-air duct or pipe.



PATENTED SEPT. 10, 1907.

G. PULLETS. DEVICE FOR SECURING AN ASBESTOS COVERING AND PLASTER TO A HOT AIR DUCT OR PIPE.

APPLICATION FILED AUG.28. 1906.

WITNESSES A rom/Em UNITED STATES PATENT, OFFICE GEORGE PULLETsos NEW YORK, N. Y.,

DEVICE FOR SECURING ALI ASBESTOS COViERING- AND PLASTER TO A HOT-AIR DUCT Specification of ;Letters Patent.

Patented Sept. 16,1907.

\ Application filed August zsjieoa Serial No. 332,339.

To all whom it may concern:

Be it known that I, GEORGE Printers, a subject of Duct or Pipe, of which the following is a specification,

such as will enable thoseskilled in the art to which it apportainstoinake and use the same.'

This invention relates to hot air-ducts or pipes used in hotels, apartment houses and other buildings, and the object thereof is to provide an improved device for securing to such air ducts or pipes a covering of asbestos and plaster with which the said air duct-s or pipes are usually provided.

The invention is fully disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in which;--

Figure l is a sectional view of one side of an air duct or pipe covered with asbestos and plaster and showing.

my improved device for securing the said covering to the air duct or pipe; Fig. 2 an end view of the smaller end of the devicewhich I employ for the purpose specified; Fig. 3 a side view' of the end of the device shown in Fig. 2; Fig. 4 a view of the end of the device opposite that shown in Fig. 2; and, Fig. 5 a sectional and perspective view of an air duct or pipe covered with asbestos and plaster, the asbestos andplaster being held in place by means of my improved fastening device or devices.

In the drawing forming part of this specification I have shown at a an ordinary hot air duct or.pipe provid ed with a covering b of asbestos over which is placed a covering 1; of plaster, and in the practice of my invention I provide a fastening device for securingtlie asbestos and plaster to the air duct or pipe which comprises a nail d having a driving head d and a pointed end d that portion of the nail d adjacent to the pointed? end d is reduced in size as shown at d, and the pointed end'd comprises a head cl which is larger than the reduced portion d? of the nail but smaller than the body of the nail adjacent to the driving head d and the pointed head d is provided, in the form of construction shown, with an annular groo've d in which is secureda spring pawl or pawls 6 In practice prefer to bore a hole or holes f intheair duct or pipe, said hole or holes being smaller than the large body portion of the nail, and in practice, thepointed end of the'nail is driven through the asbestos and through the holes f, and in this operation the spring pawl or pawlse are compressed close, to the reduced part dbf thenail, and after the nail has been driven entirely through the asbestos and the wall of the air duct or pipe the spring pawl or pawls mspring outwar'dly and prevent the withdrawal of the nail. I may also provide a washer g which is placed on the outer sideof the wall of the air duct or pipe and through which the nail is passed, said washer being intended to more securely close the holethrough which the pointed head d of the nail is driven. The outer end of the nail is also provided with a wire loop fastening device h which is wound thereon and provided with projecting loop members to which, in'prac'tice.-is secured alayer of wire mesh as shown at i, and after the asbestos covering b is secured to the air duct or pipe and thewire mesh '5.

connected with the fastening device or devices,.the

covering of plaster is placed on the air ductor' pipe as shown in Fig. 1 and in the usual manner, and the wire mesh securely holds the plaster as will be readily understood. In the constriiction shown a washerj isalso connected with the head end 11 of the nail to prevent the said head from being-driven into or through the ashestos covering and to more securely hold said covering, and said washer also serves to shorten the nail or regulate the length thereof according to the thickness of asbestos covering required, and in addition to thewasher j, or independently thereof if desired, I may employ a U-shaped .washer which is driven in between the head .of the nail and the asbestos covering for the purpose of shortening, in effect, the body'or projecting shank of the nail when the'asbesto's covering/is too thin to fill out the length of the body portion or shank of the, nail, said U-shaped washer being indicated in dotted lines in Fig. 4. i

Both the wire loop fastening device and the washer j may be removed or connected with .the nail or nails whenever desired, and in practice the pointed head end d of the nail may be driven through the asbestos covermg and the wall of the air duct or pipe if desired, in which event the boring of the hole f would not be necand lock the nail in said air duct or pipe when so driven may be employed.

duct or pi e is not absolutelynecessary as said air duct v which the pointed head or pointed end 41 may be,

driven.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is 2-- The boring of a hole or holes f in the wall of the airor pipe is usually composed of sheet metal through 1. The herein described means for secur ng asbestos covering and plaster to a hot air duct or flue, comprising for preventing its withdrawal when driven into the duct 1 or flue, and said nail being also provided adjacent to the driving head with means for securing a mesh work of wire thereto.

2. The herein described means for securing asbestos covering and plaster, to a hot air duct or flue, comprising a nail provided at one end with a driving head and at the opposite end with a pointed head, the shank of the nail being provided adjacent to the pointed head with means fol-preventing its. wlthdrawai when driven into the ductor flue, and said nail being'also provided adjacent to the driving head with\means for securing a mesh work of wire thereto, and with a washer.

' 3. The herein described means for securing asbestos covering and plaster to shot air duct or line, comprising a nail provided atone end with a driving head and at the opposite end with a pointed head, the shank of the nail adjacent to the pointed head being reduced in size and being provided adjacent to saidhead with means for preventing the withdrawal otthe-naii when driven Ito the- -duct"or flue. said: nail being also provided adjacent to the driven headwith means for securing a mesh work-ot wire thereto, substantially as shown and described.

4. The herein described means for securing asbestos covering and plaster to a hot air duct or flue, comprising a; nail provided at one end with a driving headand at the opposite end with a pointed head, the shank of the'nail adjacent to the pointed head being reduced in size and being provided adjacent to said head with means for preventing the withdrawal of the nail when driven into the duct or flue, said nail being,also provided adjacent to the driven head with means tor securing a mesh work of wire thereto, and with means for limiting the extent to which the nail may be driven into thellue, substantially as shown and described.

The herein described means tor securing asbestos covering and plaster to a hot air duct or flue, comprising a nail provided at one end with a driving head and at the opposite end with a pointed head, the shank ot the nail adjacent to the pointed head being reduced in size and being provided adjacent to said head with means for preventing the \withdrawal of the nail when driven into the duct or flue, said nail being also provided adjacent to the driving head with means for securing a mesh work of GEORGE PULLETS.

Witnesses:

F. A. STEWART, f. E. Myanmar. 

